JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2010, Vol. 40 ›› Issue (4): 57-61.

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Reducing parametric perturbations in a Buck converter by an H∞ controller

XIAN Yan-hua1,2, FENG Jiu-chao1*   

  1. 1. School of Electronic and Information Engineering, South China University of Technology, Guangdong 510641, China;
    2. College of Electronic Engineering, Guangxi Normal University, Guangxi 541004, China
  • Received:2009-09-05 Online:2010-08-16 Published:2009-09-05

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Abstract:

To reduce the effect of disturbances, a nonlinear controller was designed for a DC／DC Buck converter. First, an error model with disturbances was built based on the nonlinear model of a Buck converter. Then an H∞controller and its parameters were deduced based on the passive theory. A theoretical analysis was given to prove the stability of a closedloop control system. Finally, a  numerical simulation and circuit simulation were performed for the case of parametric perturbations of a Buck converter. The simulation results demonstrated the validity and effectiveness of the proposed control strategy.

Key words:  H∞ control, Buck converter, passive system, parametric perturbation

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